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Hello all, I have a Scrub Oak tree in my front yard, and I have St. Augustine underneath it. The grass is very thin and I was told that is because oak trees turn the soil acidic. I had lime put down last year but the grass still looks the same.ello all, I have a Scrub Oak tree in my front yard, and I have St. Augustine underneath it. The grass is very thin and I was told that is because oak trees turn the soil acidic. I had lime put down last year but the grass still looks the same.
If your area also frequently receives high rainfall levels, chances are the soil may be slightly acidic as the natural leaching action of rain encourages acidity in soil. To lower soil acidity to the soil pH range that most plants normally need, add lime, organic matter or mulches.